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The derailleur hanger is a part of the frame, not of the derailleur. There are many different brands of bike in the world, made in many different factories, and finding the right hanger for a bike is not always easy.
The best way to find the hanger you need is to open the page of hangers that are relevant to your brand of bike. Then a visual check will generally be enough to find the hanger you need.
We have also included information from Wheels Manufacturing (who's range of hangers we keep in stock) regarding which models of bicycle each hanger fits. This information was updated in January 2013, so will not cover later model years until these pages are updated. That could be in a century or two. Please use the model listing as confirmation only of your choice of derailleur hanger; a visual comparison should be the primary way to get the correct hanger.
If you can't find the hanger you're after on the brand-specific page, or can't find your brand of bike listed, then try your luck in the All Derailleur Hangers page - but beware - there are almost 200 hangers there.
If you want to look through the complete range of hangers, we recommend browsing the All Derailleur Hangers page rather than browsing each brand,to avoid the repetition caused by some hangers appearing in over 50 brand-specific pages.
Chances are we'll have the hanger you need, but, sadly, there will always be some bikes out there with hangers we do not carry, and for which Wheels Manufacturing don't make a replacement. In these cases, please refer to a dealer in the relevant brand of bike.